While the main card airs on pay-per-view, Castillo vs. Njoukani is slated to air as part of Spike TV’s two-bout “UFC Prelims” special.

Castillo, a former WEC fighter who went 5-3 in the organization, recently picked up his fourth win in five fights with a first-round TKO of Shamar Bailey at UFC 139. Castillo, a Team Alpha Male fighter and accomplished wrestler, defeated Joe Stevenson in his UFC debut earlier this year before a decision loss to Jacob Volkmann in his next outing.

Njokuani, meanwhile, avoided his fourth loss in five fights with a dominant unanimous-decision victory over Andre Winner at UFC 132. The vintage performance showed the same streaks of brilliance the Las Vegas-based striker displayed during a seven-fight WEC run (one that included three “Knockout of the Night” bonuses). Njokuani was slated to fight earlier this month at UFC 138, but opponent Paul Taylor was forced off the card just days before the event, and the fight was scrapped.